Structured Waveform Magnetic Field (SWMF) PIG Development for Cracks and Corrosion

The primary objective of this Phase I program was to demonstrate feasibility for electric resistance welded (ERW) weld crack detection, internal/external corrosion imaging, longitudinal stress mapping, and post weld heat treatment assessment using a next generation advanced MWM-Array or MR-MWM-Array integrated solution. This program focused on through wall inspection of external defects. The MWM-Arrays that JENTEK Sensors, Incorporated has been using on existing In-Line-Inspection (ILI) prototypes are limited to higher operating frequencies, which makes them suitable for inspecting ID defects at high tool speeds, but these arrays are not sensitive to mid-wall or OD defects. JENTEK's MR-MWM-Arrays can operate at lower frequencies and can detect ID, mid-wall, and OD defects, but the current technology is limited to low tool speeds that make it impractical for conventional ILI approaches. In this SBIR Program, JENTEK investigated two different concepts that have the potential to produce an ILI tool that can break through these limitations and provide ID, mid-wall, and OD defect inspection (corrosion and cracks) under ILI operating conditions: (1) Structured Waveform Magnetic Field (SWMF) and (2) Low Frequency Eddy Current with Saturating Field. Efforts during this Phase I program also included enhancing the high frequency Integrated Cleaning Tool to add the capability to characterize internally initiated cracks. This tool is currently being tested for internal corrosion and stress mapping using MWM-Arrays. It is also the basis for two new tool designs that are being developed. The work under this SBIR program focused on detection of ID surface breaking cracks in ERW welds. Different sensor designs were evaluated and several showed the capability to successfully detect flaws in ERW welds. This information will provide a benchmark for future tool design.

  • Record URL:
  • Corporate Authors:

    JENTEK Sensors, Incorporated

    110-1 Clematis Avenue
    Waltham, MA  United States  02453

    Pipeline and Hazardous Materials Safety Administration

    Department of Transportation
    East Building, 2nd Floor, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Manning, Brian
  • Publication Date: 2014-9-2


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Figures; Photos;
  • Pagination: 33p

Subject/Index Terms

Filing Info

  • Accession Number: 01638931
  • Record Type: Publication
  • Report/Paper Numbers: Research Topic No. 13.2-PHI
  • Contract Numbers: DTRT57-14-C-10015
  • Files: TRIS, ATRI, USDOT
  • Created Date: Jun 26 2017 5:41PM